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Ser is one of the to be verbs Ser is used to express: What someone or something is Who someone is The origin of someone or something The inherent qualities of someone or something

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SER tells what is someone Ella es profesora. in terms of profession or occupation

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María. SER tells what is Yo soy el profesor Vargas. ¿ Quién eres tú ? someone Yo soy With ser, as with all verbs in Spanish, the form of the verb must flip to its opposite form when it applies to someone within the conversation. soysomos eressois esson

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SER also tells our origin ¿De dónde eres tú? La señorita es de Nueva York. Yo soy de... Be aware that de must be used in the response as well as in the question. Notice that de means from and must be placed before the question word dónde when asking where someone is from: literally, From where are you?